As soon as the child is born, parents will judge the sex of ta, give her a name, teach her to live like a boy or a girl, tell her to know her body and private parts, and learn to protect herself. This is the origin of family sex education. When children are in the senior grade of primary school, they should tell them about puberty, such as menstruation and nocturnal emission, and understand the knowledge of physical development.

Sex education in adolescence is particularly important. Children may immediately fall into the conflict between emotion and sexual desire, so in the middle and high school stage, sexual health knowledge, basic principles of interpersonal communication, and awareness of gender equality should also begin to slowly penetrate into children to prepare them for entering universities or society.

Sex education for teenagers is how to make appropriate choices and judgments in the face of desires and feelings in a complex social environment. For example, how to fall in love healthily, safely and responsibly, whether to have sex, and how to understand marriage? How to avoid sexually transmitted diseases and unwanted pregnancy as much as possible? How can we reduce the risk of sex and enjoy sex without indulging in simple happiness?

In the sex education for middle-aged and elderly people, there are specific problems such as how to deal with the crisis in marriage, such as cheating, quarreling and disharmony in sexual life. How to face sexual aging and the sexual needs of the elderly?